Apple TV/FM Radio System - Manual (Page 73)

Compressing recordings
Before you record, you may want to choose a compression
rate for your recording. Recordings that are not compressed
have high-quality sound, but they take up a lot of disk space.
If you compress a recording, it takes up less disk space but
the recording sounds less clear than the original when you
play it back.
To compress recordings, follow these steps before you
record:
1 Open the Options menu and choose Preferences.
The FM Radio Preferences window appears.
2 In the Compression/Sample Rate box, choose the
compression rate you want by dragging the slider towards
“Least disk space” or “Highest Quality.”
A compression rate of 1:1 means that no compression takes
place. A compression rate of 3:1 uses a third of the disk
space that 1:1 uses. A compression rate of 6:1 saves the most
disk space.
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